package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * ClassName: ReportServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author: HeJing
 * @Create: 2024-03-28 21:27
 * @Version: 1.0
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;  // 注入订单表对象

    @Autowired
    private UserMapper userMapper;  // 注入用户对象

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用户存放begin到end范围内的每天的日期字符串
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)) {
            // 日期计算: 计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // StringUtils.join(列表，分隔符)
        // String dateStr = StringUtils.join(dateList, ",");

        // 存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date: dateList) {
            // 查询Date日期对应的营业额数据，营业额指的是: 状态为"已完成"的订单金额合计
            // select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);  // LocalTime.MIN: 当天的 00:00
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);  // LocalTime.MAX: 当天的 23:59:59.999999999
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);  // 计算出当天的营业额
            turnover = turnover == null ? 0.0: turnover;  // 数据空值处理
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用户存放begin到end范围内的每天的日期字符串
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)) {
            // 日期计算: 计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 采用动态sql
        // 存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            // 总用户数量
            totalUserList.add(userMapper.countByMap(map));

            map.put("begin", beginTime);
            // 当天新用户数量
            newUserList.add(userMapper.countByMap(map));
        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }


    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用户存放begin到end范围内的每天的日期字符串
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)) {
            // 日期计算: 计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        // 遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            // 查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer totalOrderCount = getOrderCount(beginTime, endTime, null);  // 总订单数
            orderCountList.add(totalOrderCount);

            // 查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = 已完成
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);  // 有效订单数
            validOrderCountList.add(validOrderCount);
        }

        // 计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        // 计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        // 计算订单完成率(注意除0错误)
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate =  validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }


    /**
     * 统计指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        // select od.name, sum(od.number) number from order_detail od, orders o
        // where od.order_id = o.id and o.status = 5 and o.order_time > ? and o.order_time < ?
        // group by od.name order by number desc limit 0,10
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        // 封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        // 1、查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 2、通过POI写入到excel文件中

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        XSSFWorkbook excel = null;
        try {
            // 基于模板文件创建一个新的Excel文件
            excel = new XSSFWorkbook(in);

            // 获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据: 时间段
            sheet.getRow(1).getCell(1).setCellValue("时间: " + dateBegin + "至" + dateEnd);

            // 获得第四行的行对象
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());  // 填充营业额
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());  // 填充订单完成率
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());  // 填充新增用户数

            // 获得第5行的行对象
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());  // 填充有效订单数
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());  // 填充平均客单价


            // 填充明细数据: 30天
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                // 查询具体到每一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                // 获得某一行的行对象
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            // 3、通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
                excel.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }



    }
}






























